[mythtv-users] HD Homerun Tuning Problems

[R. G. Newbury]

Daniel Kristjansson wrote:
> On Mon, 2007-06-11 at 06:07 -0400, William Munson wrote:
>> Kirk Bocek wrote:
>>> R. G. Newbury wrote:
>>>   
>>>> Scanning, as such, is NOT broken in mythtv. What generally is broken is 
>>>> what cableco's send us: a stripped stream with no identifying data, on 
>>> Why is Myth having a problem with *some* of the channels? And it can see 
>>> *some* service numbers on one multiplex but not others.
>> That is because it IS broken, despite what Geoff says. There are two 
>> significant issues with the myth scanner as documented by recent tickets 
>> in SVN.
> 
> Mr. Newbury is correct.
> 
> There is a problem with adding channels to the database when
> a transport contains both channels with channel numbers and
> unnamed channels. MythTV assumes that these unnamed channels
> are just testing channels that it shouldn't be interested in.
> However there are some cable companies in the USA that mix
> channels with and without channel numbers on the same multiplex,
> presumably because they are required by law to have channel
> numbers for OTA channels but the FCC does not require this
> for other channels. I think this is what you are remembering
> as problems #1 & #2, and in this case R. G. Newbury is entirely
> correct, this is a cable company problem which we need to work
> around.

Thank you! Nice to know that I am not completely out-to-lunch, even when 
I go for food!


> They are sending the channel number info in a separate
> stream for some of the channels, this is not QAM-256, QAM-64,
> or 8-VSB modulated so the HDHomeRun can not see the data.

Apparently these control streams are piggy-backed onto/among the 
internet streams and sent to the cableco's set top boxes. The STB's must 
contain a (flashrom?) database of frequency+PID versus channel 
name+callsign+virtual channel since this information is generally 
available deep in the setup menu.

Does anyone have any idea how these streams are sent and/or encoded? The 
streams can be found using the usual tools, but identification could be 
difficult.

Geoff
              R. Geoffrey Newbury			

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